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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7dbc615d2cf63edb150264215cef9a784d5d395662c1c750df5c4a68e8ae7032' 
  AND token = 'fbdp80D5Z1CVHseoFbI8nKmWcqDWEuZ6eIVkjeDzfug=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}