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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'de790e501b29f066b950d354acae7cb868bb6017b76364d9372b7b9c1eeda319' 
  AND token = 'RguI/uXaDxuupYDysRrLe/Uox3cTWdZfyechYTrmZQ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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