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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d95974e351b923adf96f6579f74d922605b120cdb486b8cdde31223c76b6ccf' 
  AND token = '6uxGosXCWMxXP65C48a+C5ybFsSJHLICM7uX0QW8Hrc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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