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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63c5f9cbf2491bf9811ddeb410deb77599fb37cc0437264ab6bef23c77c53c3f' 
  AND token = 'Xc5uHSv1acoTPnQ04b5BtNMQERqB+cR1huByw3unffE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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