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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '14c6af23dc2fafab63e4709d7b33d77ed7de74ad11b36a71ffd3c7803938ff86' 
  AND token = 'onLjIRs4xq6dXBibJwKv0eLykD4rCu9tYEEiRmmKLSo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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