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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '86c41cfe4cb157dda8c4faa4358df433b1561a27931020a30a4b988e9176710e' 
  AND token = '94HV3z04BOZk+hc/ncSWiuNQr642phA7ECuEUHbKQ1w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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