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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '88aece412de091aefb0f6637f786b1543d0b2f3f01da67c8a4a948796ac1bb6c' 
  AND token = 'PccDdVPRqAhcJQT76UJonkXHETsV5MRxmgTE2cOzClQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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