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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1dce39cdc5e4c2ed2b631827392477908bed9a311307eb88f1c56eeb7f525efa' 
  AND token = 'yzLgmhfxzCMs0n3HLPfaqHkLhMJhcQ/nC/jTyKSKxQo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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