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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f3886b9b91c67b0615d53bed59c73b38ba928f15661341bbd9004c2e55022e76' 
  AND token = 'ulRl+4dWN+vQTmEyYY33+UJxKaCSuH0IIA7hVIxVbMc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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