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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8f0d84e6909e41e4220690cc414e334e52353c41a883390044df92a017217558' 
  AND token = 'SQrxekPgGQSMZ4d7QDcySEZvAwAPIFkidUnN2aVnGxg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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