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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c792cf700a99f366dcb7ec338fe38de1f16d7edc08c472c5aa3f47960795fe60' 
  AND token = 'OOxlXWbagL0WF+S+pPi0UAz9i35/ZSLuExpYX8WuNk8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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