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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd07c6611240cd8b19814eafd0d8cf901285185009d81f63c841d73f9cfef874e' 
  AND token = 'YG63laUB/2ycYjh5o2CuN+hVEEXK2dH8fp4PziEdL0w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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