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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b538c027b2b09aec8c59fa4899bb08ee8d83599ddf5baf39e37775efdabfee7a' 
  AND token = 'Lv3oZWKElw2Vh2PX2zMpLBYl9YOTd0yI2zWF3G3v0tg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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