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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5bf7fffd2fdd4fcc190e02676909b5aceccecd65c21f12cab4b28517c6e607bd' 
  AND token = '4uvDRM/9gfoZe57kTVVFSe26H5iTbUrbXsgJ2Er+XO0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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