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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32ac69ef7daaf5a731913be3a1d80eb62f2821450f41fa52531e124b4c1e0fcd' 
  AND token = 'trJytcWgXKQCC11z1YTfAbzawwFG9EUNcwIbAukwgQI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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