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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f6bd731603ebf4ce2ec77e297819b0c44f60d64499b657ff547804e016c9da50' 
  AND token = '5RsbN1II9y409pycm/FAzLGdUZ1yCyTD3yg2R9FS19c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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