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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5c6fcb8c8a7125cfa953c0ba69e248b55ba1ae2283959ad934f7adfea65a9e38' 
  AND token = 'KSrHm2m2lkFIKCGtkEdfEHCj24iec5Lx/K2/GnYBixM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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