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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f6699080e29ee444537e594bdbdcae07ad29e522d0554448d42266bab9ad80d4' 
  AND token = 'LEqBg4kLbBws7eaaHAqKZJZ01QQJCie2a1Bcq6dF1rA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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