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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'af9bcb40618ba8b731df89f11cf6012a4fef58c2165a6b3e0241b5ea3551228e' 
  AND token = 'OdibBLnWZhmJQS3Sdf7bRa8PCDWmcB2JXBmxzQk1xf8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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