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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e0f1cdf4105e0e7544c3e274c8f900f5293d6f420b189b0adcc25f6f39e5fef7' 
  AND token = 'VdVGUbKJmzhhmbwOg2c0o6oipJXRfWCczJ/e4rJZa3s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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