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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e835835f5b1c4675bb27f0f7907fa597bc8c6b3f8b2670a7bf107fe9d73a0de2' 
  AND token = '/zXQl4IR4d8ddEf5Y3kAUzmT8B/WaWqLHt2NBGmkzug=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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