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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe0b62b9b2ac6b4572c79afdfcac6b0688bc3af46444b22e867c170151d5a82a' 
  AND token = 'p3rNRksuYvbQg1iEcoY2pspnyTiMuf/JmzMF2lRTd1w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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