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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98b7f4e4cd659eea147bbd1b5ec65d93d1905ba8fc687027ec376d2f4f3bce2d' 
  AND token = 'k2EyFr2FNzaOSS3GBxBFbG4WfLTvh8yT+fTJtS/L+Lw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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