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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0e68286178927cc93c5ee9eb65208fe71186336857a20954fa678fec3dc5e76e' 
  AND token = 'TopPKv3vU6YpAyJd0GNkwaFA1sqkI+MQgeg3MKejOUs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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