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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf58d48efc6a90977e8081788d31abaa0acd20e616ec7ae15fb83d70b2d958a0' 
  AND token = 'aFUTEzj1R1hYvvyLDMVTRnlauURRTTtShMFMs/x3Vck=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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