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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '31c57830328760a20c4f5644a07d93c3a9b4778181c40eb473d17b5e101decf2' 
  AND token = 'ydoYZdZtDrTor4qxwjusEor2j84ndEQCtR9uGVwQcSY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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