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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '861ccb2fea205fee5a58734f252b314ed271df05eb4b1135db06658308b30b16' 
  AND token = 'j12GybqzY7VI5VlMVTjkPNdoY7mEo+OhYGSev3ADb5w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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