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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1fd6372ef173ea99e17f8b1749ab6b9f8dc963b232bf39a4df438b3443fe4c90' 
  AND token = 'GFAiX8yQzemkUWxAKqSPu68xAk0VhevFQWnDWjKsDkQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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