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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac9dc556caa3129fb51dd92e7e01f268a6b9dd2473c695e04c2188806a0253c5' 
  AND token = '/4PVd9Ry818lNFCXfWAhtSI6Bz/JORgElwn23q513gQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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