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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd7f60807add8a5fc3c10c38433860cd6aca3446f737d77277fb90c06f7bd776b' 
  AND token = 'GqDxmG/o9y8IA+vEvkY8BtA9AMYrRRtBBBLxWed+Y/4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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