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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8e4ff6a5f8e0bb9eceb388440bd3063f1e22adcc0ea5ffc6b0e86a107b8c6e70' 
  AND token = 'G9WOV5UPAWdoYHPI8aqHneOD6v3Y5w/tgluZg/YLcnc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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