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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eaaa67bf8b13cda11ad5d51be30684561b66dc90b2bc112356ccf6b0edabe0ee' 
  AND token = 'e2kiWHtMa4XZO+WavdxCYqMpswH6GtyYVOzDqs56MY4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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