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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c821798f34cda259f01232b6fd8c6d2328313c2830ad04ba0b81036a85e7ac3d' 
  AND token = 'ynYj0soAWylR/ME8Joi4kY5QcBTiacMJ4p4keeLxXP8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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