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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b06a083b09927483bea72ae44de1de94bb899b5efcabb3362458ab36a8169ffc' 
  AND token = 'g/aCQLIWOm66pao2QItGlWGhXiJO0TSf1oHFZ+mn5gc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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