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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '48ff959783a38dcae2c6463ec4ddacea0a10feb9209b2966c1d97fdd0f50ae39' 
  AND token = 'WII8l7JjvxriItxPk9ppeU/WOcC+r33wFPxn+e3lNOY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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