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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e82e90e4f92a3ec6d08c03799b71711a3ef5335c6c41332a434a063a8f7a35a0' 
  AND token = 'B/XnRdImZkSRqD3qwtvhdmTVlvT5vF6b85yKvK8wJUk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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