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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '66e0bd95c5cb6aba2ff5717ff4c1e5dffd73a97d7111da792820ebcb36de85eb' 
  AND token = 'Akw744uT7tzCRu5sO/xtEL5os50MXdUcHodDV2EoPGs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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