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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f77652bbe7a8bafc57742dc7777ef63ff2f9c654ae89d7fc82b917d84f0065f1' 
  AND token = '83WASVynsVZI6L+9Jp2eX8kr/9amTB7GWjRr0o/3bC4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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