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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '06fd62a70f391b068538fa42f0f91825587ab4688e9eb59d6872c1998920c743' 
  AND token = 'UEBM60XUk8gcNvm71CWtw9OhR/zRGcd5A3rOHDPe9Rc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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