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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b637793e8d8d12137e63f0acde8a2321da9a188fb592da7c7e885fc73967eb5f' 
  AND token = 'Tc4JLW8xFspGzgSic7IUK9R2yTVT1UniS6907pfc6YU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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