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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '54847b25a4a3dafd2b8f8da5ed78100aabf74ba38925487e769a2e8a44f0518a' 
  AND token = 'UL08JEqW5NbYVntGUhmb/xChT2n6TiS0u6iVdt53WLc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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