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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76be816b33d3b94190e4e4069ce16756a70c766036b6cecb117eb3577bc86a18' 
  AND token = '3Mtjj6pBX7zsgBHBGwLVRAWs+EcwWcYGvu28nlv5Pno=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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