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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e23e222244886502e974c0dd6799ac442e0349b79b6d9c52ac6585a2918516ca' 
  AND token = 'UjwbrCsnphekty61hcF6HyP8z6iSeS8dJcrDh6A2KSA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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