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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd8d5b87fd08026cff2e7317c3ec37cc18186d015f8dcec93c5f7b66ec4866e74' 
  AND token = 'qE/i42nKoXGTYhD5f4qUm0oLwk/TMuFr5Z/lfnO4SLw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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