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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c4bdc8acc8f5ad9d7e9e98068e23264cee4264928ecada7209b6b7df07dacc89' 
  AND token = 'pVNpIZogxibxbZEsYoTHkQ7vra/yKRLIIzUqtPT4lNM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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