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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c7163099d6ad24946bdda3ab2469df59ba0fbd2d3d448ef079c707b6cdac158' 
  AND token = 'uHggBq6j3XvID7/ckCWW3YLcMo5EPSe5M9Pt9l6F8nE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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