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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e9257dd075643938eb9713c03a8a2f1872ac9eea70df91bd69cd5c21c9c92674' 
  AND token = 'xS8HhmB2HJaACMs+aU2ifK6U6lSwiRHralUjyYmvzX8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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