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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8157ee017893c1b406b2c25c1cae362feafc07402110502606a4810e8fdddd94' 
  AND token = 'OKn8VOYDejtvIorY+JMOV8osO1LaXnhW0qDlO4cuZoM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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