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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71441e59544e8c0a4f824afaa130b1b1095da0d45e55b59ab524e74ef1a3207e' 
  AND token = 'nFYiKk0C+QO18oG97PF+LHppCGaFz6IE26bRPwTX//c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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