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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d718d3b7d423f69e81f3d2a1b40491cb64d4de8df7147d9c3bb69a48c7cc995' 
  AND token = 'mQlDXZPqw0idRC5X3+HSse15VDKQX4ElbnJsFJbeNZs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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