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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee966060d1e4e013931eae83bad4b833288ca93a389479c33bb7ad9710b4db84' 
  AND token = '6WDJp9ZgRd4DTeZstXOviEd9EfY/LFUxr8U37aCwm84=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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