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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94b7e42d416d0ccfe2c3b29a0b6f295edaa0a4edf70e756d7f020f2b803d5fc7' 
  AND token = 'HapuhqAg7YOGb0Ip4mdDAP7wgOiG3gW5ZD1Vq/troP8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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