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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b473655e02f7b22d5da5ce1d85cd298cc02b1a5e5807a6da562e6b37bb06797' 
  AND token = 'bRjTkDJYrHRuvESnd6ZjvKw8+7YTD/UK6qDDSXvtScc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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