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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f1dad16a5a340fc840300bed0133eed1460a2884d5be8d0820fd99231eeed5f1' 
  AND token = '4BbLGGOqdCi/sYMpCyEce9t+CM99Q/H/873MTyph7HE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00065

JSON explain

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