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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1cdc6eac182fde21006c7b33d5a4ad31f39c2ba56cdb1fc86c69080be114c0ac' 
  AND token = 'pqEJhd5kORdCHEPXZ3wsliCU13X6n5E9NNa7SZx32GI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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