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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a52170e2398b9b2dae03befef8dda128f381ae7561890d4172f2ce3f9f6253b2' 
  AND token = '0ceH7WkTuvjLZixz3RTG428PqAcoWvW0GHShrPZzPk0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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