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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9955ecaba8d78a67e209a4bd8c605ed224887bcb318b21c6656a87c6aa6c1d23' 
  AND token = 'xzvJhu0cz1iWsg6cIY2PisVWfP6PxJAv2tXp8qoEws8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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