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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '542d6f0bd85aa98f74431c6d89e72ab93bf71a4bc181773531b901c5d5919fba' 
  AND token = '7I/BQIFjZiIPmiBtJM7DkdeeikCMPISPppqO1d2eBxk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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