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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e056e9681a85c592b32217fb93ba25f7b522e14f3d2a1eb28a6974dbf71bf815' 
  AND token = 'VcRYB2jEoksNLHvnkbdkzvji9GZ9bNyjuToWK5QXmL8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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