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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '563c642ec36e6cca77929d3bad673e53ebfa87983ae9d2337396e04551b53e67' 
  AND token = '8lsEMrP0q/vkAbMaKy+xKLgcqHrb/8EYadXaVe5JtO8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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