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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92569084927c45f7e28351b5dbf56bb7ea603e77cbea1f787517dba1cfebcc68' 
  AND token = 'ov2SSgis4gA/KX0cv7p2REwtyWORJrekqiBQHuczMCM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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