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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b2338a151f4c7619aa45fcb4af2460cafb27359fe97598fd6e6ee36ace24e3a' 
  AND token = '5XXubPmg5Bjqcti8oIl0684GLqhB/9Hmz5wURIrIS2s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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