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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b4c6798b8a335556fd4a8c9db1d62a1a2f694c02c88b5e5faff6e8f644a41b81' 
  AND token = 'Sjbx3SwywSvd8mJA8MkYk59I9ZNirMlRQVQJy5b4lBw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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