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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3cce490a252e621fec3070da757a639904ebbea3d96b9d7c0a26e7caded21040' 
  AND token = 'vjAE0HkGeVsqdY69kaX3xr4J2q2iaOJsADQ504N/rJ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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