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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9cd7434e85f07fb70386a043df2df1dcab5ad375f9037b27e8e5e56632df7b4c' 
  AND token = 'oSvs2kgAruTXuO9nzUFU/aNSkEPDyd2xUyeI2eBjwoE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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