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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '06221ae8c32cba67e1b0195140a4156ea2d35c7fc5afb30cd53c1f638aab0364' 
  AND token = '968ZMGArIBTFwq44RPR7BK4NtoUTAlWva7zBhr6ti4c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00060

JSON explain

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